diff --git a/doc/PRE_UPGRADE.md b/doc/PRE_UPGRADE.md
index b43cd17..cfd5017 100644
--- a/doc/PRE_UPGRADE.md
+++ b/doc/PRE_UPGRADE.md
@@ -1 +1 @@
-We are moving from MariaDB to PostgreSQL database. There is no database migration for now. It advised to export your OPML, install TTRSS and import back the OPML file.
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+If you are upgrading from version 20230630 or earlier: we are moving from MariaDB to PostgreSQL database. There is no database migration for now. It advised to export your OPML, install TTRSS again and import back the OPML file.